IWMPEffects2::OnWindowMessage method (effects.h)
[The feature associated with this page, Windows Media Player SDK, is a legacy feature. It has been superseded by MediaPlayer. MediaPlayer has been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer instead of Windows Media Player SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The OnWindowMessage method is called by Windows Media Player to pass window messages to a visualization.
Syntax
HRESULT OnWindowMessage(
[in] UINT msg,
[in] WPARAM WParam,
[in] LPARAM LParam,
[in] LRESULT *plResultParam
);
Parameters
[in] msg
UINT that identifies the window message.
[in] WParam
WPARAM specifying a window message parameter.
[in] LParam
LPARAM specifying a window message parameter.
[in] plResultParam
Pointer to an LRESULT specifying the result code for the window message.
Return value
This method returns an HRESULT.
Remarks
Your implementation must only return S_OK if it has handled the window message. If it has not handled the window message, it should return S_FALSE. If this method is not implemented, return E_NOTIMPL.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows Media Player 9 Series or later. |
| Target Platform | Windows |
| Header | effects.h |